Mathematician and HSE graduate Dmitry Rybin has found a counterexample to the Dinits-Garg-Gomans hypothesis from network flow theory, which had remained open for nearly 30 years. GPT-5.6 Pro generated the proof in just a few hours and four prompts. The specialist provided no specific hints to the model, only general instructions like "make a breakthrough," "disprove the general case," and "continue exploring." Rybin referred to the chat as a "pure meme." The result has not yet undergone independent verification.